Aerodynamic design and numerical analysis of jet cooling blast deflector

Abstract

[Objectives] At present, seawater cooling jet blast deflectors are used on American and Russian aircraft carriers to protect crew and equipment from aircraft engine blasts. Although seawater cooling is effective, seawater cooling jet blast deflectors require such complex facilities as pumps and pipelines, making their maintenance inconvenient.[Methods] With reference to the principle of film cooling on turbine vanes, this paper propose an alternative design of jet cooling for the blast deflector, using jet flows to remove and isolate high temperature flows from engine blasts. The location of slot and quantity of hole designed for film cooling on the deflector are investigated. The calculation of temperature and pressure on the deflector with different options of jet hole are made by CFD method, the cooling effect by this approach is then analyzed and validated.[Results] The calculation results show that the jet cooling effects are equivalent to those of seawater cooling jet blast deflectors, and can reduce the average temperature of the 95% core area to acceptable levels.[Conclusions] The jet flow cooling method is generally effective in achieving heat isolation. This numerical analysis and design method can be helpful in the research and design of passive jet blast deflectors.

Keywords

• aircraft carrier
• jet cooling
• jet blast deflector
• numerical analysis